ZnO Interface Modified LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> Toward Boosting Lithium Storage
Yunyan Li, Xifei Li, Junhua Hu, Wen Liu, Hirbod Maleki Kheimeh Sari, Dejun Li, Qian Sun, Liang Kou, Zhanyuan Tian, Le Shao, Cheng Zhang, Jiujun Zhang, Xueliang Sun
Abstract
In this work, an amorphous ZnO was coated on LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) using a sol‐gel strategy method. The NCM coated with 1 wt.% ZnO and a thickness of about 3 nm exhibits an improved cycling performance, accompanied by a lower capacity fading (from 194.8 to 133.8 mAh g −1 , i.e., 68%) than that of the pristine one (i.e., only 34%) after 300 cycles at 0.2 C. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) indicate that the ZnO coating can improve extraction/insertion of Li + and inhibit the increase in impedance of the NCM cathode material. This approach may benefit the performance improvement of the Ni‐rich cathode materials in Lithium‐ion batteries (LIBs).